標準編號:	GB 27790-2020
中文名稱:	城鎮燃氣調壓器
英文名稱:	City gas pressure regulator
中標分類:	P47    供氣工程
行業分類:	GB    國家標準
ICS分類:	91.140 91.140    建筑物中的設施 91.140
發布機構:	國家市場監督管理總局 國家標準化管理委員會
發布日期:	2020-11-17
實施日期:	2021-12-1
標準狀態:	valid
替代舊標準:	GB 27790-2011 城鎮燃氣調壓器
翻譯語言:	英文
文件格式:	PDF
中文字符數:	42000 字
翻譯價格(元):	2940.0
交付時間:	付款后 1 個工作日

Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative. This standard is developed in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB 27790-2011 City gas pressure regulators. In addition to editorial changes, the following main technical changes have been made with respect to GB 27790-2011: ——The scope is modified (see clause 1; clause 1 of Edition 2011); ——Some terms and definitions are modified or added (see clause 3; clause 3 of Edition 2011); ——The classification and model designation are modified (see clause 4; clause 4 of Edition 2011); ——The structure and material are modified (see clause 5; clause 5 of Edition 2011); ——The special requirements for meter pressure regulator are added (see 5.2.3 and 6.13); ——The technical requirements for nondestructive testing of steel pressure-bearing parts are added (see 5.3.2.5); ——The technical requirements for fail state, integrated shut-off device, integrated monitor and integrated release device are added (see 6.9, 6.10, 6.11 and 6.12); ——The requirements for gas strength test are added (see 7.3.1); ——The methods for gas resistance test of diaphragm and low-temperature resistance test of diaphragm are modified (see 7.4.2 and 7.4.3; 7.4.2 and 7.4.3 of Edition 2011); ——The requirement that no intermediate static characteristic test be conducted when the applicable range of inlet pressure and outlet pressure of pressure regulator is too narrow is added (see 7.6.1.1); ——The inspection method for failure state is added (see 7.10); ——The test method for integrated shut-off device is added (see 7.11); ——The test method for integrated monitor is added (see 7.12); ——The test method for integrated release device is added (see 7.13); ——The test methods for torsion resistance and bending resistance of meter pressure regulator are added (see 7.14); ——the inspection rules are modified (see clause 8; clause 8 of Edition 2011); ——The marking and label of pressure regulator are modified (see 9.1; 9.1 of Edition 2011); ——The operating instructions of pressure regulator are modified and the requirements for providing noise and corresponding operating conditions are added (see 9.2; 9.2 of Edition 2011); ——The physical and mechanical properties of rubber materials as well as gas resistance are modified (see Annex A; Annex A of Edition 2011). This standard was proposed by and is under the jurisdiction of the Ministry of Housing and Urban-Rural Development of the People's Republic of China. The previous edition of this standard is as follows: ——GB 27790-2011. City gas pressure regulator 1 Scope This standard specifies terms, definitions and symbols, classification and labelling, structure and materials, requirements, test methods, inspection rules, marking, label and operating instructions as well as packaging, transport and storage of city gas pressure regulator (hereinafter referred to as pressure regulator). This standard is applicable to the pressure regulators with a nominal diameter up to 400mm, an operating temperature range not exceeding -20℃~60℃ with the lower limit not less than the dew point temperature of the gas, and an inlet pressure up to 10.0MPa. This standard is not applicable to the pressure regulators for liquefied petroleum gas in cylinders and those for dimethyl ether. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 150 (all parts) Pressure vessel GB/T 191 Packaging - Pictorial marking for handling of goods GB/T 229 Metallic materials - Charpy pendulum impact test method GB/T 528 Rubber, vulcanized or thermoplastic - Determination of tensile stress-strain properties GB/T 531.1 Rubber vulcanized or thermoplastic - Determination of indentation hardness - Part 1: Durometer method (Shore hardness) GB/T 699 Quality carbon structure steels GB/T 1047 Pipework components - Definition and selection of nominal size GB/T 1173 Casting aluminium alloy GB/T 1220 Stainless steel bars GB/T 1239.2 Cold coiled helical springs technical specifications - Part 2: Compressions spring GB/T 1348 Spheroidal graphite iron castings GB/T 1591 High strength low alloy structural steels GB/T 1681 Rubber - Determination of rebound resilience of vulcanizates GB/T 1682 Rubber, vulcanized - Determination of low-temperature brittleness - Single test piece method GB/T 1690 Rubber, vulcanized or thermoplastic - Determination of the effect of liquids GB/T 3077 Alloy structure steels GB/T 3191 Aluminium and aluminium alloys extruded bars, rods GB/T 3280 Cold rolled stainless steel plate, sheet and strip GB/T 3452.1 Fluid power systems - O-rings - Part 1: Inside diameters, cross-sections, tolerances and size identification code GB/T 3452.2 Fluid power systems - O-rings - Part 2: Quality acceptance criteria GB/T 3512 Rubber, vulcanized or thermoplastic - Accelerated ageing and heat resistance tests - Air-oven method GB/T 4423 Copper and copper-alloy cold-drawn rod and bar GB/T 6388 Transport package shipping mark GB/T 7233.1 Steel castings - Ultrasonic examination - Part 1: Steel castings for general purposes GB/T 7306.1 Pipe threads with 55 degree thread angle where pressure-tight joints are made on the threads - Part 1: Parallel internal and taper external threads GB/T 7306.2 Pipe threads with 55 degree thread angle where pressure-tight joints are made on the threads - Part 2: Taper internal and external threads GB/T 7759 (all parts) Rubber, vulcanized or thermoplastic - Determination of compression set GB/T 7762 Rubber, vulcanized or thermoplastic - Resistance to ozone cracking - Static strain test GB/T 9124.1 Steel pipe flanges - Part 1: PN designated GB/T 9124.2 Steel pipe flanges - Part 2: Class designated GB/T 9440 Malleable iron castings GB/T 9443 Steel and iron castings - Liquid penetrant inspection GB/T 9444 Steel and iron castings - Magnetic particle inspection GB/T 9969 General principles for preparation of instructions for use of industrial products GB/T 12224 General requirements for industrial steel valves GB/T 12227 General purpose industrial valve - Specification of spheroidal graphite iron castings GB/T 12228 General purpose industrial valves - Specification of carbon steel forgings GB/T 12229 General purpose industrial valves - Specification of carbon steel castings GB/T 12716 Pipe threads with the thread angle of 60 degrees where pressure-tight joints are made on threads GB/T 13306 Plates GB/T 13384 General specifications for packing of mechanical and electrical product GB/T 13934 Rubber, vulcanized or thermoplastic - Determination of flex cracking and crack growth (De Mattia) GB/T 15115 Die casting aluminium alloys GB/T 17213.15 Industrial-process control valves - Part 8-3: Noise considerations - Control valve aerodynamic noise prediction method GB/T 20801.5 Pressure piping code - Industrial piping - Part 5: Inspection and testing GB/T 23934 Hot formed helical compression springs - Technical Requirement GB/T 32249 Aluminum and aluminum-alloy die forgings, hand forgings and rolled ring forgings - General specification GB/T 38343 Technical specification for flange joints installation GB 50058 Code for design of electrical installations in explosive atmospheres CJ/T 180-2014 Manually operated gas valves for gas installations of buildings CJ/T 335-2010 Slam-shut valves and relief valves for city gas HG/T 20592 Steel pipe flanges (PN designated) HG/T 20615 Steel pipe flanges (Class designated) JB/T 6440 Methods of radiographic examination for steel castings valves JB/T 7248 Technical specification for low temperature service steel casting for valves JB/T 7927 Valve cast steel visual quality requirements JB/T 7944 Coiled helical springs - Sampling inspection NB/T 47008 Carbon steel and alloy steel forgings for pressure equipment NB/T 47009 Alloy steel forgings for low temperature pressure equipment NB/T 47010 Stainless and heat-resisting steel forgings for pressure equipment NB/T 47013 (all parts) Nondestructive testing of pressure equipments 3 Terms, definitions and symbols 3.1 Terms and definitions For the purposes of this standard, the following terms and definitions apply. 3.1.1 gas pressure regulator equipment whose function is to automatically regulate the gas outlet pressure to maintain it within certain pressure range ? 3.1.2 series of pressure regulator generic term for pressure regulators with the same design concept, similar structure but different nominal diameter 3.1.3 direct acting pressure regulator pressure regulators which have a direct control by virtue of the outlet pressure variation over the actuator which drives the control members to move Note: See Figure 1 for an example of the action principle of the direct acting pressure regulator. Key: 1——setting element; 2——actuator; 3——diaphragm; 4——sensing line; 5——valve seats; 6——seat ring; 7——regulator body; 8——control member; 9——casing of actuator; 10——breather/exhaust line; 11——metallic partition; 1＋3——controller; Figure 1 Example of direct acting pressure regulator 3.1.4 indirect acting pressure regulator pressure regulators which control by virtue of the outlet pressure variation over the actuator which drives the control members to move after the amplification of the pilot Note: See Figure 2 for an example of the indirect acting pressure regulator. Key: 1——pilot; 2——process line; 3——actuator; 4——sensing line; 5——motorization chamber; 6——valve seats; 7——seat ring; 8——regulator body; 9——control member; 10——metallic partition; 11——casing of actuator; Figure 2 Example of indirect acting pressure regulator 3.1.5 meter pressure regulator pressure regulator installed in front of the user's gas meter, with a nominal diameter not greater than DN25 and a maximum inlet pressure not greater than 0.2 MPa 3.1.6 integrated monitor pressure regulating unit connected in series with the working pressure regulator, which starts to operate when the outlet pressure of the pressure regulator exceeds the set range of the working pressure regulator to maintain the outlet pressure of the pressure regulator within the allowable range 3.1.7 nominal diameter of pressure regulator nominal diameter of pressure regulator inlet, indicating pressure regulator dimensions. ? 3.1.8 nominal pressure numerical marking code concerned to pressure, rounded to an integral Note: In this standard, it is used to express the nominal pressure at inlet and outlet flange of the pressure regulators. 3.1.9 design pressure pressure value which is used to determine strength of the casing or other parts at appropriate design temperature 3.1.10 inlet pressure range pressure range within which the given accuracy class at pressure regulator inlet is guaranteed Note: The same pressure regulator may have different inlet pressure ranges. 3.1.11 maximum inlet pressure maximum inlet pressure value permissible within inlet pressure range 3.1.12 minimum inlet pressure minimum inlet pressure value permissible within inlet pressure range ? 3.1.13 outlet pressure range pressure range within which the given accuracy class at pressure regulator outlet is guaranteed Note: The same pressure regulator may have different outlet pressure ranges, and the pressure regulator may obtain the required outlet pressure range by replacing certain parts. 3.1.14 maximum outlet pressure maximum outlet pressure value permissible within outlet pressure range 3.1.15 minimum outlet pressure minimum outlet pressure value permissible within outlet pressure range 3.1.16 reference conditions gas state where the temperature is 15℃ and absolute pressure is 101.325 kPa 3.1.17 volumetric flow rate gas volume in reference conditions which flows through the pressure regulator in unit time Note: The unit is m3/h. 3.1.18 flow coefficient air flow passed when the absolute pressure is opened fully at the critical condition where the inlet absolute pressure is 0.243kPa and the temperature is 15℃ Note: The unit is m3/h. 3.1.19 performance expressing the outlet pressure as a function of the inlet pressure and volumetric flow rate 3.1.20 performance curve graphic representation of the outlet pressure as a function of the volumetric flow rate by changing volumetric flow rate (from increase to decrease) in case of constant inlet pressure and adjustment condition Note: This standard adopts the performance curve when the inlet temperature is 15℃. 3.1.21 family of performance curves set of performance curves obtained at different inlet pressures in the same adjustment condition 3.1.22 set point nominal outlet pressure of a family of performance curves of the pressure regulator Note: The set point may be equal to the rated outlet pressure. 3.1.23 hysteresis band difference between two outlet pressure values corresponding to the same volumetric flow rate when the volumetric flow rate increases and decreases on one performance curve 3.1.24 motorization pressure gas pressure within high pressure chamber of pressure regulator actuator 3.1.25 stable conditions conditions where the outlet pressure are gradually changing to a stable value after interference generation 3.1.26 accuracy percentage of average value of the absolute values of maximum positive deviation and maximum negative deviation between actual outlet pressure and set point within operating range on the same family of performance curves to the set point 3.1.27 accuracy class maximum permissible value of accuracy multiplied by 100 3.1.28 lock-up pressure outlet pressure at zero volumetric flow rate on performance curve when the control member of pressure regulator is at a lock-up position Note: The time from the volumetric flow rate at lock-up point to the zero volumetric flow rate shall be greater than the response time for locking up the pressure regulator. 3.1.29 lock-up pressure class maximum permissible value of ratio of difference between actual lock-up pressure and set point to set point multiplied by 100 ? 3.1.30 maximum accuracy flow rate minimum one among the maximum flow rates capable of guaranteeing the given accuracy class for inlet pressure range under specified set point 3.1.31 minimum accuracy flow rate maximum one among the minimum flow rate or the minimum flow rate in quiescent operation capable of guaranteeing the given accuracy class for inlet pressure range under specified set point 3.1.32 lock-up pressure zone zone between zero flow rate and minimum flow rate on each corresponding performance curve of inlet pressure and set point (see Zone 1 in Figure 3) Key: p2——outlet pressure; p1——inlet pressure; AC——accuracy class; SG——lock-up pressure class; Q——volumetric flow rate; Qmax,p1——maximum flow rate under p1; p2s——set point; Qmin,p1——minimum flow rate under p1; 1——lock-up pressure zone SZ. Figure 3 Lock-up pressure zone (stable condition) 3.1.33 class of lock-up pressure zone maximum permissible value of ratio of minimum flow rate to maximum flow rate multiplied by 100 3.1.34 class of lock-up pressure zone of family of performance curves maximum permissible value of ratio of minimum accuracy flow rate to maximum accuracy flow rate on the family of performance curves multiplied by 100 3.1.35 operating temperature range temperature range of medium and body in which the pressure regulator components and additional devices are capable of operating normally 3.1.36 control member movable element installed in the flow passage of the pressure regulator, which is used for controlling the opening degree of the flow passage of the pressure regulator ? 3.1.37 fail close pressure regulator pressure regulator that automatically closes or tends to close when the main diaphragm fails or the power system that moves the control member fails 3.1.38 fail open pressure regulator pressure regulator that automatically opens or tends to open when the main diaphragm fails or the power system that moves the control member fails 3.1.39 integrated release device self-actuated release unit installed on the pressure regulator body and, when the control pressure reaches the release pressure set value, releasing gas to the atmosphere with limited flow rate 3.1.40 integrated shut-off device self-actuated shut-off device installed on the pressure regulator body Note: It is characterized in that when the pressure regulator works normally, the integrated shut-off device is on, when the pressure at the outlet of the pressure regulator reaches the set value of shut-off pressure, the gas passage is automatically cut off by virtue of the gas pressure at the outlet of the pressure regulator, and the actuator is reset manually after troubleshooting the gas system. 3.2 Symbols For the purposes of this standard, the symbols listed in Table 1 apply. Table 1 Symbols and explanations S.N. Symbol Unit Explanation 1 A % Accuracy 2 Amin % Elongation 3 AC — Accuracy class 4 AQ — Shut-off pressure accuracy class 5 Cg — Flow coefficient 6 Cgi — Flow coefficient under test conditions 7 Cgx — Flow coefficient of pressure regulator under partial opening 8 DN — Letter symbol before nominal diameter identification 9 d — Relative density of test medium 10 K1j — Shape coefficient under test conditions 11 K1 — Shape coefficient 12 m — Number of test conditions under subcritical flow condition in the flow coefficient Cg test 13 n — Number of test conditions under critical flow condition in the flow coefficient Cg test 14 p MPa Design pressure 15 p1 MPa Inlet pressure 16 p1av MPa Medium value between maximum inlet pressure and minimum inlet pressure 17 p1t Pa Pressure of test medium in the pressure-bearing chamber at the first measurement 18 p1max MPa Maximum inlet pressure 19 p1min MPa Minimum inlet pressure 20 p2 MPa Outlet pressure 21 p2c MPa Initial outlet pressure 22 p2t Pa Pressure of test medium in the pressure-bearing chamber at the second measurement 23 p2int MPa Initial outlet pressure between p2min and p2max 24 p2max MPa Maximum outlet pressure within outlet pressure range 25 p2min MPa Minimum outlet pressure within outlet pressure range 26 p2s MPa Set point 27 pa MPa或Pa Atmospheric pressure 28 pb MPa Lock-up pressure 29 pb1 MPa Pressure obtained by carrying out thermometric correction for lock-up pressure measured at the first time in the lock-up pressure test 30 pb2 MPa Pressure obtained by carrying out thermometric correction for lock-up pressure measured at the second time in the lock-up pressure test 31 pn Pa Reference pressure 32 pta MPa Actual value of shut-off pressure 33 pts MPa Set value of shut-off pressure 34 MPa Lock-up pressure measured at the second time in the lock-up pressure test 35 pmax MPa Maximum design pressure 36 Q m3/h Volumetric flow rate 37 Qi m3/h Calculated leakage of a pressure-bearing chamber 38 Qm m3/h Volumetric flow rate measured when pressure regulator inlet temperature is t1 39 Qmax m3/h Maximum flow rate 40 Qmax, p1min m3/h Maximum flow rate when inlet pressure is p1min 41 Qmax, p1 m3/h Maximum flow rate at a certain inlet pressure 42 Qmin m3/h Minimum flow rate 43 Qmin, p1 m3/h Minimum flow rate at a certain inlet pressure 44 Qmin, p1av m3/h Minimum flow rate when inlet pressure is p1av 45 Qmin, p1min m3/h Minimum flow rate at minimum inlet pressure 46 Qmin, p1max m3/h Minimum flow rate at maximum inlet pressure 47 QL m3/h Maximum test volumetric flow rate of a characteristic line 48 QR m3/h Maximum flow rate provided by test bench 49 SG — Lock-up pressure class 50 SZ — Class of lock-up pressure zone 51 SZp2 — Class of lock-up pressure zone of family of performance curves 52 t h Pressure-holding time 53 t1 ℃ Test medium temperature in front of pressure regulator 54 t1t ℃ Temperature of test medium within pressure-bearing chamber during the measurement for the first time 55 t2t ℃ Temperature of test medium within pressure-bearing chamber during the measurement for the second time 56 tb1 ℃ Pressure regulator outlet temperature measured for the first time in the lock-up pressure test 57 tb2 ℃ Pressure regulator outlet temperature measured for the second time in the lock-up pressure test 58 V m3 Volume of pressure-bearing chamber 59 △＋ MPa Positive deviation between actual value and set point of outlet pressure 60 △－ MPa Negative deviation between actual value and set point of outlet pressure 61 △p MPa Minimum differential pressure at inlet and outlet at which the accuracy class may be guaranteed by the pressure regulator 62 △t h Interval between two measurements 63 △ph Pa Hysteresis band 64 △pt Pa Corrected pressure drop 65 △pmax MPa Maximum differential pressure borne by diaphragm 66 δ5 % Elongation of steels 67 δp1 MPa Inlet pressure range 68 δp2 MPa Outlet pressure range 4 Classification and model 4.1 Classification The classification of pressure regulators shall meet the requirements of Table 2. Table 2 Classification of pressure regulators S.N. Classification method Category 1 Working principle Action mode Direct acting, and indirect acting Failure state Fail-open, and fail-close 2 Connection type Flange, and thread 3 Maximum inlet pressure/MPa 0.01, 0.2, 0.4, 0.8, 1.6, 2.0, 2.5, 4.0, 6.3 and 10.0 4.2 Model 4.2.1 Model preparation Product model preparation shall meet the following requirements: a) The model preparation of pressure regulators shall be in the following format: ? b) The working principle code of pressure regulators shall meet the requirements of Table 3; Table 3 Operating principle codes of pressure regulator Operating principle code Operating principle Action mode Failure state Direct acting Indirect acting Fail open Fail close Z1 √ - √ - Z2 √ - - √ J1 - √ √ - J2 - √ - √ ZB √ - √ - Notes: 1. "√" indicates that it is applicable; "-" indicates that it is not applicable. 2 ZB represents the meter pressure regulator. c) The nominal diameter of pressure regulator refers to the nominal diameter of inlet connection; d) The maximum inlet pressure, p1max, is divided into 9 grades, i.e., 0.01MPa, 0.2MPa, 0.4MPa, 0.8MPa, 1.6MPa, 2.5MPa, 4.0MPa, 6.3MPa and 10.0MPa, with the pressure value in MPa marked. e) As for the connection type, L is for threaded connection, and the code is omitted in case of flanged connection; f) Custom numbers, including manufacturer-defined numbers, such as series of pressure regulator. 4.2.2 Example Examples for the models of pressure regulators are as follows: a) RTJ1-150/0.4-A, indicating a fail open indirect acting pressure regulator which has a nominal diameter of DN150, a maximum inlet pressure of 0.4 MPa and a custom number of A, and is subjected to flange connection; b) RTZB-15/0.01 L, indicating a meter pressure regulator which has a nominal diameter of DN15 and a maximum inlet pressure of 0.01MPa and is subjected to threaded connection. ? 5 Structure and material 5.1 General requirements 5.1.1 Design pressure 5.1.1.1 Metallic pressure-bearing parts The design pressure of metallic pressure-bearing parts (include metallic parts bearing pressure at normal operation or metallic parts bearing pressure after diaphragm and differential pressure seal fails) shall meet the following requirements: a) When the metallic pressure-bearing parts are subjected to inlet pressure p1, their design pressure shall not be less than the maximum inlet pressure and shall not be less than 0.4 MPa; b) When metallic pressure-bearing parts are protected by safety protection devices, and the pressure to which they are subjected after the diaphragm or differential pressure seal fails is less than the inlet pressure and greater than or equal to normal operating pressure, the design pressure of the metallic pressure-bearing parts shall not be less than 1.1 times the pressure borne by them after the failure of diaphragm or differential pressure seal, or the design pressure specified in Item a) may be adopted; c) For pressure-bearing parts which are subjected to a pressure less than the normal operating pressure after the failure of diaphragm or differential pressure seal, the design pressure shall not be less than 1.1 times the maximum normal operating pressure, or the design pressure specified in Item a) may be adopted; 5.1.1.2 Metallic partition The design pressure of metallic partition shall not be less than 1.1 times the difference between maximum pressure at high-pressure side and minimum pressure at low-pressure side, however the design pressure of metallic partition in the valve shall meet the requirements of 5.1.1.1a). 5.1.1.3 Diaphragm The design pressure of diaphragm shall meet the following requirements: a) When the maximum differential pressure, △pmax, borne by the diaphragm is less than 0.015 MPa, the design pressure of the diaphragm shall not be less than 0.02 MPa; b) When 0.015 MPa≤△pmax<0.5 MPa, the design pressure of the diaphragm shall not be less than 1.33△pmax; c) When △pmax≥0.5 MPa, the design pressure of the diaphragm shall not be less than 1.1△pmax and it shall not be less than 0.665 MPa. 5.1.2 Operating temperature range The operating temperature ranges of the pressure regulators shall be -10℃~60℃ or -20℃~60℃. 5.2 Structure 5.2.1 Connection type at inlet and outlet 5.2.1.1 The connection between the pressure regulator and the upstream and downstream pipelines shall meet the following requirements: a) The connection dimension and sealing surface type of the flange shall meet the requirements of GB/T 9124.1, GB/T 9124.2, HG/T 20592 or HG/T 20615. b) Pipe threads shall only be used for pressure regulators with a nominal diameter not greater than DN50, and shall meet the requirements of GB/T 7306.1, GB/T 7306.2 or GB/T 12716. 5.2.1.2 The nominal pressure of the flange shall not be less than the design pressure of the pressure regulator body, and shall be selected from the following series of values: 0.6 MPa, 1.0 MPa, 1.6 MPa, 2.0 MPa, 2.5 MPa, 4.0 MPa, 5.0 MPa, 6.3 MPa, 10.0 MPa and 11.0 MPa. 5.2.1.3 The nominal pressure of the inlet and outlet flanges of the pressure regulator shall be the same.

Foreword i 1 Scope 2 Normative references 3 Terms, definitions and symbols 3.1 Terms and definitions 3.2 Symbols 4 Classification and model 4.1 Classification 4.2 Model 5 Structure and material 5.1 General requirements 5.2 Structure 5.3 Materials 6 Requirements 6.1 Appearance 6.2 Strength of pressure containing part 6.3 Inspection for finished product of diaphragm 6.4 External seal 6.5 Performance 6.6 Flow coefficient, Cg 6.7 Adaptability at limit temperature 6.8 Durability 6.9 Failure state 6.10 Performance of integrated shut-off device 6.11 Performance of integrated monitor 6.12 Performance of integrated release device 6.13 Torsion resistance and bending resistance of meter pressure regulator 7 Test methods 7.1 General requirements 7.2 Appearance 7.3 Strength of pressure-bearing parts 7.4 Inspection of finished diaphragm 7.5 External seal 7.6 Performance 7.7 Flow coefficient Cg 7.8 Adaptability at limit temperature 7.9 Durability 7.10 Failure state 7.11 Integrated shut-off device 7.12 Integrated monitor 7.13 Integrated release device 7.14 Torsion resistance and bending resistance of meter pressure regulator 8 Inspection rules 8.1 Inspection classification 8.2 Inspection items 8.3 End-of-manufacturing inspection 8.4 Type inspection 8.5 Judging rules 9 Marking, label and operating instructions 9.1 Marking and label 9.2 Operating instructions 10 Packaging, transport and storage 10.1 Packaging 10.2 Transport 10.3 Storage Annex A (Normative) Physical and mechanical properties of rubber materials and gas resistance Annex B (Informative) Storage of rubber parts of pressure regulators Annex C (Normative) Alternative method for determining flow coefficient of mass flow regulators Annex D (Informative) Flow characteristic Annex E (Informative) Noise

城鎮燃氣調壓器 1 范圍 本標準規定了城鎮燃氣用燃氣調壓器(以下簡稱調壓器)的術語和定義、符號、分類與標記、結構和材料、要求、試驗方法、檢驗規則、標志、標簽、使用說明書以及包裝、運輸、儲存。 本標準適用于進口壓力不大于10.0 MPa、工作溫度范圍不超出20℃～60℃且其下限不低于燃氣露點溫度、公稱尺寸不大于400 mm的調節出口壓力的調壓器。 本標準不適用于瓶裝液化石油氣調壓器和二甲醚用的調壓器。 2 規范性引用文件 下列文件對于本文件的應用是必不可少的。凡是注日期的引用文件，僅注日期的版本適用于本文件。凡是不注日期的引用文件，其最新版本(包括所有的修改單)適用于本文件。 GB／T 150(所有部分) 壓力容器 GB／T 191 包裝儲運圖示標志 GB／T 229 金屬材料 夏比擺錘沖擊試驗方法 GB／T 528 硫化橡膠或熱塑性橡膠 拉伸應力應變性能的測定 GB／T 531.1 硫化橡膠或熱塑性橡膠 壓入硬度試驗方法 第1部分：邵氏硬度計法(邵爾硬度) GB／T 699 優質碳素結構鋼 GB／T 1047 管道元件 公稱尺寸的定義和選用 GB／T 1173 鑄造鋁合金 GB／T 1220 不銹鋼棒 GB／T 1239.2 冷卷圓柱螺旋彈簧技術條件 第2部分：壓縮彈簧 GB／T 1348 球墨鑄鐵件 GB／T 1591 低合金高強度結構鋼 GB／T 1681 硫化橡膠回彈性的測定 GB／T 1682 硫化橡膠 低溫脆性的測定 單試樣法 GB／T 1690 硫化橡膠或熱塑性橡膠 耐液體試驗方法 GB／T 3077 合金結構鋼 GB／T 3191 鋁及鋁合金擠壓棒材 GB／T 3280 不銹鋼冷軋鋼板和鋼帶 GB／T 3452.1 液壓氣動用O形橡膠密封圈 第1部分：尺寸系列及公差 GB／T 3452.2 液壓氣動用O形橡膠密封圈 第2部分：外觀質量檢驗規范 GB／T 3512 硫化橡膠或熱塑性橡膠 熱空氣加速老化和耐熱試驗 GB／T 4423 銅及銅合金拉制棒 GB／T 6388 運輸包裝收發貨標志 GB／T 7233.1 鑄鋼件 超聲檢測 第1部分：一般用途鑄鋼件 GB／T 7306.1 55°密封管螺紋 第1部分：圓柱內螺紋與圓錐外螺紋 GB／T 7306.2 55°密封管螺紋 第2部分：圓錐內螺紋與圓錐外螺紋 GB／T 7759(所有部分) 硫化橡膠或熱塑性橡膠 壓縮永久變形的測定 GB／T 7762 硫化橡膠或熱塑性橡膠 耐臭氧龜裂 靜態拉伸試驗 GB／T 9124.1 鋼制管法蘭 第1部分：PN系列 GB／T 9124.2 鋼制管法蘭 第2部分：Class系列 GB／T 9440 可鍛鑄鐵件 GB／T 9443 鑄鋼鑄鐵件 滲透檢測 GB／T 9444 鑄鋼鑄鐵件 磁粉檢測 GB／T 9969 工業產品使用說明書 總則 GB／T 12224 鋼制閥門 一般要求 GB／T 12227 通用閥門 球墨鑄鐵件技術條件 GB／T 12228 通用閥門 碳素鋼鍛件技術條件 GB／T 12229 通用閥門 碳素鋼鑄件技術條件 GB／T 12716 60°密封管螺紋 GB／T 13306 標牌 GB／T 13384 機電產品包裝通用技術條件 GB／T 13934 硫化橡膠或熱塑性橡膠 屈撓龜裂和裂口增長的測定(德墨西亞型) GB／T 15115 壓鑄鋁合金 GB／T 17213.15 工業過程控制閥 第8-3部分：噪聲的考慮 空氣動力流流經控制閥產生的噪聲預測方法 GB／T 20801.5 壓力管道規范 工業管道 第5部分：檢驗與試驗 GB／T 23934 熱卷圓柱螺旋壓縮彈簧 技術條件 GB／T 32249 鋁及鋁合金模鍛件、自由鍛件和軋制環形鍛件 通用技術條件 GB／T 38343 法蘭接頭安裝技術規定 GB 50058 爆炸危險環境電力裝置設計規范 CJ／T 180—2014 建筑用手動燃氣閥 CJ／T 335—2010 城鎮燃氣切斷閥和放散閥 HG／T 20592 鋼制管法蘭(PN系列) HG／T 20615 鋼制管法蘭(Class系列) JB／T 6440 閥門受壓鑄鋼件射線照相檢驗 JB／T 7248 閥門用低溫鋼鑄件技術條件 JB／T 7927 閥門鑄鋼件外觀質量要求 JB／T 7944 圓柱螺旋彈簧抽樣檢查 NB／T 47008 承壓設備用碳素鋼和合金鋼鍛件 NB／T 47009 低溫承壓設備用合金鋼鍛件 NB／T 47010 承壓設備用不銹鋼和耐熱鋼鍛件 NB／T 47013(所有部分) 承壓設備無損檢測 3 術語和定義、符號 3.1 術語和定義 下列術語和定義適用于本文件。 3.1.1 燃氣調壓器 gas pressure regulator 自動調節燃氣出口壓力，使其穩定在某一壓力范圍內的設備。 3.1.2 調壓器系列 series of pressure regulator 相同設計原理下，結構相似的不同公稱尺寸調壓器的總稱。 3.1.3 直接作用式調壓器 direct acting pressure regulator 利用出口壓力變化，直接控制驅動器帶動調節元件運動的調壓器。 注：直接作用式調壓器的作用原理示例見圖1。 說明： 1——設定元件； 2——驅動器； 3——膜片； 4——信號管； 5——閥座； 6——閥墊； 7——調壓器殼體； 8——調節元件； 9——驅動器殼體； 10——呼吸孔； 11——金屬隔板； 1＋3——控制器。 圖1 直接作用式調壓器示例 3.1.4 間接作用式調壓器 indirect acting pressure regulator 利用出口壓力變化，經指揮器放大后控制驅動器帶動調節元件運動的調壓器。 注：間接作用式調壓器的作用原理示例見圖2。 說明： 1——指揮器； 2——過程管； 3——驅動器； 4——信號管； 5——驅動腔； 6——閥座； 7——閥墊； 8——調壓器殼體； 9——調節元件； 10——金屬隔板； 11——驅動器殼體。 圖2 間接作用式調壓器示例 3.1.5 表前調壓器 meter pressure regulator 安裝于用戶燃氣表前，公稱尺寸不大于DN25且最大進口壓力不大于0.2 MPa的調壓器。 3.1.6 內置監控單元 integrated monitor 當調壓器出口壓力超過工作調壓器設定范圍時，開始運行以維持調壓器出口壓力在允許范圍值內的與工作調壓器串聯為一體的調壓單元。 3.1.7 調壓器公稱尺寸 nominal diameter of pressure regulator 調壓器進口的公稱尺寸，表示調壓器的尺寸規格。 3.1.8 公稱壓力 nominal pressure 一個用數字表示的與壓力有關的標示代號，為圓整數。 注：本標準中用于表示調壓器的進、出口法蘭的公稱壓力。 3.1.9 設計壓力 design pressure 在相應的設計溫度下，用于確定殼體或其他零件強度的壓力值。 3.1.10 進口壓力范圍 inlet pressure range 能保證調壓器進口給定穩壓精度等級的壓力范圍。 注：同一調壓器可能具有不同的進口壓力范圍。 3.1.11 最大進口壓力 maximum inlet pressure 在進口壓力范圍內，所允許的最高進口壓力值。 3.1.12 最小進口壓力 minimum inlet pressure 在進口壓力范圍內，所允許的最低進口壓力值。 3.1.13 出口壓力范圍 outlet pressure range 能保證調壓器出口給定穩壓精度等級的壓力范圍。 注：同一調壓器可能具有不同的出口壓力范圍，調壓器可通過更換某些零部件來獲得所需的出口壓力范圍。 3.1.14 最大出口壓力 maximum outlet pressure 在出口壓力范圍內，所允許的最高出口壓力值。 3.1.15 最小出口壓力 minimum outlet pressure 在出口壓力范圍內，所允許的最低出口壓力值。 3.1.16 基準狀態 reference conditions 溫度為15℃，絕對壓力為101.325 kPa時的氣體狀態。 3.1.17 流量 volumetric flow rate 單位時間內流過調壓器的基準狀態下的氣體容積。 注：單位為m3／h。 3.1.18 流量系數 flow coefficient 進口絕對壓力0.243 MPa，溫度為15℃，在臨界狀態下，調壓器全開所通過的空氣流量。 注：單位為m3／h。 3.1.19 靜特性 performance 表述出口壓力隨進口壓力和流量變化的關系。 3.1.20 靜特性線 performance curve 在進口壓力和調整狀態不變時，通過先增加流量后降低流量得到的出口壓力隨流量變化的曲線。 注：本標準采用進口溫度為15℃時的靜特性線。 3.1.21 靜特性線族 family of performance curves 同一調整狀態下各不同進口壓力下所得靜特性線的集合。 3.1.22 實測設定壓力 set point 調壓器的一族靜特性線的名義出口壓力。 注：實測設定壓力可等于額定出口壓力。 3.1.23 壓力回差 hysteresis band 一條靜特性線上流量增大和流量減小時，同一流量值對應兩個出口壓力值之差。 3.1.24 驅動壓力 motorization pressure 調壓器驅動器高壓腔內的氣體壓力。 3.1.25 靜態 stable conditions 出口壓力在干擾發生后逐漸平穩變化到穩定值后的狀態。 3.1.26 穩壓精度 accuracy 一族靜特性線上，工作范圍內出口壓力實際值與實測設定壓力間的最大正偏差和最大負偏差絕對值的平均值對實測設定壓力的百分比。 3.1.27 穩壓精度等級 accuracy class 穩壓精度的最大允許值乘以100。 3.1.28 關閉壓力 lock-up pressure 調壓器調節元件處于關閉位置時，靜特性線上零流量處的出口壓力。 注：從開始關閉點流量減少至零流量所用的時間大于調壓器關閉的響應時間。 3.1.29 關閉壓力等級 lock-up pressure class 實際關閉壓力與實測設定壓力之差對實測設定壓力之比的最大允許值乘以100。 3.1.30 最大精度流量 maximum accuracy flow rate 在規定的實測設定壓力下，針對進口壓力范圍，能保證給定穩壓精度等級的最大流量中的最小者。 3.1.31 最小精度流量 minimum accuracy flow rate 在規定的實測設定壓力下，針對進口壓力范圍，能保證給定穩壓精度等級的最小流量和靜態工作的最小流量中的最大者。 3.1.32 關閉壓力區 lock-up pressure zone 每一相應進口壓力和實測設定壓力的靜特性線上，在零流量與最小流量間的區域(見圖3中區域1)。 說明： p2——出口壓力； p1——進口壓力； AC——穩壓精度等級； SG——關閉壓力等級； Q——流量； Qmax，p1——p1下的最大流量； p2s——實測設定壓力； Qmin，p1——p1下的最小流量； 1——關閉壓力區SZ。 圖3 關閉壓力區(靜態) 3.1.33 關閉壓力區等級 class of lock—up pressure zone 最小流量和最大流量的比值的最大允許值乘以100。 3.1.34 靜特性線族的關閉壓力區等級 class of lock-up pressure zone of family of performance curves 靜特性線族上，最小精度流量和最大精度流量的比值的最大允許值乘以100。 3.1.35 工作溫度范圍 operating temperature range 調壓器組件及附加裝置能正常工作的介質和本體溫度范圍。 3.1.36 控制元件 control member 安裝在調壓器流道中的可移動元件，用于控制調壓器流道的開度。 3.1.37 失效關閉型調壓器 fail close pressure regulator 主膜片失效或使控制元件運動的動力系統失效時，自動關閉或趨向關閉的調壓器。 3.1.38 失效開啟型調壓器 fail open pressure regulator 主膜片失效或使控制元件運動的動力系統失效時，自動開啟或趨向開啟的調壓器。 3.1.39 內置放散單元 integrated release device 安裝在調壓器本體上，當控制壓力達到放散壓力設定值時，以有限流量向大氣中放散燃氣的自力式放散單元。 3.1.40 內置切斷單元 integrated shut-off device 安裝在調壓器本體上的自力式切斷裝置。 注：其特點為調壓器正常工作時，內置切斷單元處于開啟狀態、調壓器出口壓力達到切斷壓力設定值時依靠調壓器出口的燃氣壓力自動切斷燃氣通路、燃氣系統故障排除后執行機構由人工復位。 3.2 符號 表1中的符號適用于本文件。 表1 符號和說明 序號 符號 單位 說明 1 A ％ 穩壓精度 2 Amin ％ 伸長率 3 AC — 穩壓精度等級 4 AQ — 切斷壓力精度等級 5 Cg — 流量系數 6 Cgi — 測試工況下的流量系數 7 Cgx — 調壓器在部分開度下的流量系數 8 DN — 公稱尺寸標識前的字母符號 9 d — 試驗介質的相對密度 10 K1j — 測試工況下的形狀系數 11 K1 — 形狀系數 12 m — 流量系數Cg試驗中亞臨界流動狀態下的測試工況數 13 n — 流量系數Cg試驗中臨界流動狀態下的測試工況數 14 p MPa 設計壓力 15 p1 MPa 進口壓力 16 p1av MPa 最大進口壓力與最小進口壓力的中間值 17 p1t Pa 第一測量時承壓腔內試驗介質的壓力 18 p1max MPa 最大進口壓力 19 p1min MPa 最小進口壓力 20 p2 MPa 出口壓力 21 p2c MPa 初設出口壓力 22 p2t Pa 第二次測量時承壓腔內試驗介質的壓力 23 p2int MPa p2min、p2max之間的初設出口壓力 24 p2max MPa 出口壓力范圍內的最大出口壓力 25 p2min MPa 出口壓力范圍內的最小出口壓力 26 p2s MPa 實測設定壓力 27 pa MPa或Pa 大氣壓力 28 pb MPa 關閉壓力 29 pb1 MPa 關閉壓力試驗中第一次測量測得的關閉壓力經溫度修正后的壓力 30 pb2 MPa 關閉壓力試驗中第二次測量測得的關閉壓力經溫度修正后的壓力 31 pn Pa 基準壓力 32 pta MPa 切斷壓力實際值 33 pts MPa 切斷壓力設定值 34 MPa 關閉壓，力試驗中第二次測量測得的關閉壓力 35 pmax MPa 最大設計壓力 36 Q m3/h 流量 37 Qi m3/h 一個承壓腔的計算泄漏量 38 Qm m3/h 調壓器進口溫度為t1時試驗測得的流量 39 Qmax m3/h 最大流量 40 Qmax，p1min m3/h 進口壓力為p1min時的最大流量 41 Qmax，p1 m3/h 某一進口壓力下的最大流量 42 Qmin m3/h 最小流量 43 Qmin，p1 m3/h 某一進口壓力下的最小流量 44 Qmin，p1av m3/h 進口壓力為p1av時的最小流量 45 Qmin，p1min m3/h 最小進口壓力下的最小流量 46 Qmin，p1max m3/h 最大進口壓力下的最小流量 47 QL m3/h 一條特性線的最大試驗流量 48 QR m3/h 試驗臺能提供的最大流量 49 SG — 關閉壓力等級 50 SZ — 關閉壓力區等級 51 SZp2 — 靜特性線族的關閉壓力區等級 52 t h 保壓時間 53 t1 ℃ 調壓器前試驗介質溫度 54 t1t ℃ 第一次測量時承壓腔內試驗介質的溫度 55 t2t ℃ 第二次測量時承壓腔內試驗介質的溫度 56 tb1 ℃ 關閉壓力試驗中第一次測量測得的調壓器出口溫度 57 tb2 ℃ 關閉壓力試驗中第二次測量測得的調壓器出口溫度 58 V m3 承壓腔體容積 59 △＋ MPa 出口壓力實際值與設定值間正偏差 60 △－ MPa 出口壓力實際值與設定值間負偏差 61 △p MPa 調壓器尚能保證穩壓精度等級的最小進出口壓差 62 △t h 兩次測量的間隔時間 63 △ph Pa 壓力回差 64 △pt Pa 修正后的壓力降 65 △pmax MPa 膜片所承受的最大壓差 66 δ5 ％ 鋼材的伸長率 67 δp1 MPa 進口壓力范圍 68 δp2 MPa 出口壓力范圍 4 分類與型號 4.1 分類 調壓器的分類應符合表2的要求。 表2 調壓器的分類 序號 分類方法 類別 1 工作原理 作用方式 直接作用式、間接作用式 失效狀態 失效開啟式、失效關閉式 2 連接形式 法蘭、螺紋 3 最大進口壓力/MPa 0.01、0.2、0.4、0.8、1.6、2.0、2.5、4.0、6.3、10.0 4.2 型號 4.2.1 型號編制 產品型號編制應符合下列要求： a) 調壓器的型號編制按以下格式： 自定義號 連接型式代號 最大進口壓力 調壓器公稱尺寸 工作原理代號 燃氣調壓器代號 b) 調壓器的工作原理代號應符合表3的要求； 表3 調壓器的工作原理代號 工作原理代號 工作原理 作用方式 失效狀態 直接作用式 間接作用式 失效開啟式 失效關閉式 Z1 √ — √ — Z2 √ — — √ J1 — √ √ — J2 — √ — √ ZB √ — √ — 注1：“√”表示適用，“—”表示不適用。 注2：ZB為表前調壓器。 c) 調壓器公稱尺寸為進口連接的公稱尺寸； d) 最大進口壓力p1max，按0.01 MPa、0.2 MPa、0.4 MPa、0.8 MPa、1.6 MPa、2.5 MPa、4.0 MPa、6.3 MPa和10.0 MPa分9級選用，標出以MPa為單位的壓力值； e) 連接型式，螺紋連接的代號為L，法蘭連接時省略代號； f) 自定義號，包含調壓器系列等制造商自定義編號。 4.2.2 示例 調壓器型號示例如下： a) RTJ1-150／0.4 A，表示失效開啟、公稱尺寸為DN150、最大進口壓力為0.4 MPa、法蘭連接、自定義號為A的間接作用式調壓器； b) RTZB-15／0.01 L，表示公稱尺寸為DN15、最大進口壓力為0.01 MPa、螺紋連接表前調壓器。 5 結構和材料 5.1 一般要求 5.1.1 設計壓力 5.1.1.1 金屬承壓件 金屬承壓件(包括正常工作時承受壓力的金屬零部件和膜片或差壓密封件失效后承受壓力的金屬零部件)，其設計壓力應符合下列要求： a) 當金屬承壓件承受進口壓力p1時，其設計壓力不應小于最大進口壓力，且不小于0.4 MPa； b) 當金屬承壓件有安全保護裝置保護時，若膜片或差壓密封件失效后其承受的壓力小于進口壓力且不小于正常工作壓力時，金屬承壓件的設計壓力不應小于膜片或差壓密封件失效后其承受的壓力的1.1倍，或采用a)中規定的設計壓力； c) 膜片或差壓密封件失效后其承受的壓力小于正常工作壓力的金屬承壓件，設計壓力不應小于最大正常工作壓力的1.1倍，或采用a)中規定的設計壓力。 5.1.1.2 金屬隔板 金屬隔板的設計壓力不應小于高壓側最大壓力與低壓側最小壓力之差的1.1倍，但閥體內金屬隔板的設計壓力應符合5.1.1.1a)的要求。 5.1.1.3 膜片 膜片設計壓力應符合下列要求： a) 當膜片承受的最大壓差△pmax＜0.015 MPa時，膜片設計壓力不應小于0.02 MPa； b) 當0.015 MPa≤△pmax＜0.5 MPa時，膜片設計壓力不應小于1.33△pmax； c) 當△pmax≥0.5 MPa時，膜片設計壓力不應小于1.1△pmax，且不應小于0.665 MPa。 5.1.2 工作溫度范圍 調壓器工作溫度范圍應為－10℃～60℃或－20℃～60℃。 5.2 結構 5.2.1 進出口連接型式 5.2.1.1 調壓器與上、下游管道的連接應符合下列要求： a) 法蘭的連接尺寸及密封面型式應符合GB/T 9124.1、GB/T 9124.2、HG/T 20592或HG/T 20615的要求； b) 管螺紋應僅用于公稱尺寸不大于DN50的調壓器，并應符合GB/T 7306.1、GB/T 7306.2或GB/T 12716的要求。 5.2.1.2 法蘭的公稱壓力不應小于調壓器殼體的設計壓力，并應在0.6 MPa、l.0 MPa、1.6 MPa、2.0 MPa、2.5 MPa、4.0 MPa、5.0 MPa、6.3 MPa、10.0 MPa、11.0 MPa系列值中選用。 5.2.1.3 調壓器的進出口法蘭公稱壓力應相同。 5.2.2 其他配置 5.2.2.1 間接作用式調壓器的驅動壓力應由調壓器進口燃氣提供。 5.2.2.2 調壓器調壓信號的取壓位置及信號管的尺寸應能提供穩定的壓力信號。 5.2.2.3 呼吸管或呼吸裝置應有防止異物進入的措施。 5.2.2.4 內置切斷單元、內置監控單元、內置放散單元等內置安全單元應與調壓器的工作相互獨立。 5.2.2.5 當內置安全單元為切斷單元或監控單元時，間接作用式調壓器的驅動力應由該安全裝置下游提供。 5.2.2.6 調壓器使用的電氣附件應符合GB 50058的要求。 5.2.2.7 公稱尺寸不小于DN200的調壓器應設置吊裝點。 5.2.2.8 調壓器的法蘭接頭安裝應符合GB/T 38343的要求。 5.2.3 表前調壓器結構要求 5.2.3.1 表前調壓器應有防止擅自調節設定狀態的措施。 5.2.3.2 用于組裝和固定調壓器零部件的螺絲孔、軸釘孔等不應穿入燃氣通道。孔與燃氣通道之間的最小壁厚不應少于1 mm。 5.2.3.3 呼吸孔應防止被堵塞，其設置位置應防止膜片被從呼吸孔插入的尖銳物損傷。 5.2.4 公稱尺寸和結構長度 5.2.4.1 調壓器進口、出口連接公稱尺寸的選用應符合GB/T 1047的要求。 5.2.4.2 進口、出口公稱尺寸相同的法蘭連接的調壓器，其結構長度應采用表4或表5所示值。因結構特殊，允許按用戶要求的其他尺寸。 表4 法蘭連接的調壓器結構長度 公稱尺寸DN 法蘭公稱壓力 結構長度公差mm PN6/10/16/20 Class 150 PN 25/40 Class 300 PN 63/100 Class 600 結構長度mm 表5 法蘭連接的調壓器備選結構長度 公稱尺寸DN 法蘭公稱壓力 結構長度公差mm PN6/10/16/25/40 Class 150/Class 300 PN63/100 Class 600 結構長度mm 5.2.4.3 內螺紋連接的調壓器結構長度應符合表6的要求，因結構特殊，允許按用戶要求的其他尺寸。 表6 內螺紋連接的調壓器結構長度 公稱尺寸DN 結構長度mm 結構長度公差mm 15 90 ＋1.0 －1.5 20 100 25 120 32 140 ＋1.0 －2.0 40 170 50 200 5.3 材料 5.3.1 一般要求 5.3.1.1 調壓器零部件的材料對城鎮燃氣、加臭劑和燃氣中允許的雜質應具有抗腐蝕的能力，還應考慮材料氫脆的影響。 5.3.1.2 調壓器零部件的材料，應附有生產單位的質量證明文件。調壓器制造單位應按質量證明文件對材料進行驗收，必要時應進行復驗。 5.3.1.3 調壓器材料應符合國家現行有關標準。 5.3.2 金屬材料 5.3.2.1 調壓器零部件的金屬材料應符合下列要求： a) 除緊固件及管接頭外的承壓件及金屬隔板應根據使用條件，選用表7所列的材料； 表7 承壓件材料的使用條件 材料 材料性質Amina ％ 使用條件 最大設計壓力pmax MPa (p×DNb)max 最大公稱尺寸 軋鋼、鍛鋼 16 — — — 鑄鋼 15 — — — 球墨鑄鐵 7 2.0 150 — 15 2.0 500 — 可鍛鑄鐵 6 2.0 100 100 銅鋅鍛造合金 15 — — 25 銅錫和銅鋅鑄造合金 5 2.0 100 100 15 — — 25 鍛造鋁合金 4 2.0 — 50 7 — — 50 鑄造鋁合金、壓鑄鋁合金 1.5 1.0 25 150 4 2.0 160 — a 伸長率Amin應符合所選材料相關標準的要求。 b 調壓器公稱尺寸，對指揮器殼體是指其進口連接的公稱尺寸。 b) 承壓件的緊固件所用鋼材的伸長率Amin不應小于9％； c) 管接頭所用鋼材的伸長率Amin不應小于8％。 5.3.2.2 最低工作溫度低于－10℃但不低于－20℃，且調壓器設計壓力不小于2.5 MPa時，調壓器閥體、閥蓋、驅動器殼體和法蘭蓋等所用的金屬材料，除應符合5.3.2.1的要求外還應符合下列要求： a) 碳鋼、低合金鋼應進行夏比V型缺口沖擊試驗，試驗溫度為－20℃，3個試樣的平均沖擊功不應小于27 J，允許一個試樣的試驗結果小于平均值，但不應小于20 J，沖擊試驗方法及要求應符合GB/T 229的要求； b) 奧氏體不銹鋼不做沖擊試驗； c) 鍛造及鑄造鋁合金的抗拉強度不高于350 MPa時，不做沖擊試驗。 5.3.2.3 承壓件材料應符合下列要求： a) 鋼制承壓件材料應符合GB/T 12224、GB/T 12229的要求； b) 鐵制承壓件材料應符合GB/T 12227或GB/T 9440的要求； c) 鋁制承壓件材料應符合GB/T 15115、GB/T 1173或GB/T 32249的要求。 5.3.2.4 調壓器承壓件的材料為碳鋼時，應選用優質碳素結構鋼。用于焊接的碳鋼、低合金鋼的化學成分應符合下列要求： a) 碳的質量分數，當采用爐前分析時不應超過0.23％，當采用成品分析時不應超過0.25％； b) 硫的質量分數不應超過0.020％，磷的質量分數不應超過0.025％； c) 碳當量，當采用爐前分析時不應超過0.43％，當采用成品分析時不應超過0.45％。 注：碳當量(CE)計算公式為： CE＝wC(％)＋wMn/6(％)＋[wCr(％)＋wMo(％)＋wv(％)]/5＋[wNi(％)＋wCu(％)]/15。 5.3.2.5 鋼制承壓件無損檢測應符合下列要求： a) 鋼制承壓件應按表8和表9的要求進行無損檢測。 b) 無損檢測應在材料熱處理完成后或焊接熱處理完成后進行，或選擇在機加工前或后進行檢驗；表面無損檢測應包括內外表面，但外螺紋、孔和內螺紋除外。 c) 抽檢時，承壓件不合格的，應從生產批次中再抽取兩倍或以上的送檢樣品進行再次檢驗。如仍有不合格，檢驗范圍應擴大到生產批次內的所有同類承壓件。 d) 承壓件返修應按相應工藝規程進行，并用同樣的方法再次檢驗合格。 e) 無損檢測技術等級應符合NB/T 47013的要求。